Semiconductor capacitor and manufacturing method

ABSTRACT

A capacitor can prevent a problem of step coverage in semiconductor device, caused by a thickness of an insulator film and an upper metal film included a metal-insulator-metal (MIM) capacitor, between the MIM capacitor region and its circumferential region. A capacitor in a semiconductor device includes a first metal film provided with a recess having a predetermined depth over a semiconductor substrate. An insulator film and a second metal film may be formed in the recess with a thickness corresponding to a depth of the recess. The insulator and second metal films are disconnected from an inner lateral side of the recess. A dielectric film including a plurality of plugs is in contact with the first and second metal films and the insulator film. A plurality of metal electrodes is in contact with the plugs over the dielectric film.

The present application claims priority under 35 U.S.C. 119 to Korean Patent Application No. 10-2006-0137335, filed on Dec. 29, 2006, which is hereby incorporated by reference in its entirety.

BACKGROUND

Example FIGS. 1A to 1D are cross sectional views explaining a related method of manufacturing a MIM (metal-insulator-metal) capacitor of a semiconductor device. As shown in example FIG. 1A, a lower metal film (lower capacitor electrode) 11, an insulator film 12 and an upper metal film (upper capacitor electrode) 13 are sequentially formed over a semiconductor substrate 1. Then, as shown in example FIG. 1B, a photoresist material is coated onto the upper metal film (upper capacitor electrode) 13, and the coated photoresist material is patterned so as to form a first photoresist pattern 14.

By performing an etching process using the first photoresist pattern 14 as a mask, the upper metal film 13 and the insulator film 12 are etched selectively. Through the selective etching process, an upper metal film pattern (upper capacitor electrode) 13 a and an insulator film pattern 12 a are formed, thereby completing an MIM (metal-insulator-metal) capacitor.

As shown in example FIG. 1C, etching and cleaning steps are performed to remove the first photoresist pattern 14. After that, a dielectric film 16 is formed over an entire surface of the semiconductor substrate 1 including the upper metal film pattern 13 a. To form contact holes 18 in the dielectric film 16, a photoresist material is coated and patterned, thereby forming a second photoresist pattern 17. Through an etching process using the second photoresist pattern 17 as a mask, the dielectric film 16 is etched selectively, thereby forming the contact holes 18 to open predetermined portions of the lower metal film 11 and the upper metal film 13 a.

After removing the second photoresist pattern 17 by etching and cleaning, as shown in example FIG. 1D, a conductive film is deposited over the dielectric film pattern 16 so that the contact holes 18 are filled by the conductive film. Plugs 19, formed by the conductive film, are in contact with the lower metal film 11 and the upper metal film pattern 13 a. After that, a metal film is deposited over the dielectric film pattern 16. The deposited metal film is patterned to thereby form metal electrodes 20 which contact the plugs 19. A nitride film is deposited over the metal electrodes 20 and selectively patterned, thereby forming a nitride film pattern 21 with openings for the metal electrodes 20.

The semiconductor device manufactured by the aforementioned method may have a problem of step coverage between an MIM capacitor region and its circumferential region. The problem may occur when depositing the dielectric film 16, due to the thickness of the insulator film 12 a and the upper metal film (upper capacitor electrode) 13 a included in the MIM capacitor. Due to the step coverage between the MIM capacitor region and its circumferential region, a DOF (Depth of Focus) margin becomes insufficient, creating a problem of an imprecise pattern. Also, an entirely uneven surface of a wafer causes a limitation in flatness achievable in a chemical mechanical polishing (CMP) process.

SUMMARY

Embodiments relate to a capacitor which can prevent a problem of step coverage in semiconductor device, caused by a thickness of an insulator film and an upper metal film included a metal-insulator-metal (MIM) capacitor, between the MIM capacitor region and its circumferential region.

Embodiments relate to a capacitor of semiconductor device including a first metal film provided with a recess having a predetermined depth over a semiconductor substrate. An insulator film and a second metal film may be formed in the recess with a thickness corresponding to a depth of the recess. The insulator and second metal films are disconnected from an inner lateral side of the recess. A dielectric film including a plurality of plugs is in contact with the first and second metal films and the insulator film. A plurality of metal electrodes is in contact with the plugs over the dielectric film.

Embodiments relate to a capacitor of semiconductor device which includes a first metal film provided with a recess having a predetermined depth over a semiconductor substrate. A plurality of capacitors may be formed by sequentially depositing an insulator film and a second metal film over the recess.

Embodiments relate to a capacitor in semiconductor device which includes a first metal film (lower electrode of first capacitor) provided with a recess having a predetermined depth over a semiconductor substrate. A first insulator film and a second metal film may be formed in the recess with a thickness corresponding to a depth of the recess. The first insulator film and second metal film are disconnected from an inner lateral side of the recess. A first dielectric film pattern may include a plurality of first plugs which are respectively in contact with the first and second metal films and the first insulator film. A first metal line is in contact with the first plug. A first step-coverage metal film (lower electrode of second capacitor), is in contact with the first plug which is brought into contact with the second metal film, provided at a predetermined interval from the first metal line. A second insulator film and a fourth metal film (upper electrode of second capacitor) are disconnected from the inner lateral side of the first step-coverage metal film over the lower portion of the first step-coverage metal film. A second dielectric film pattern including a plurality of second plugs which are respectively brought into contact with the first metal line, the fourth metal film and the first step-coverage metal film over the first metal line and the first step-coverage metal film. A second metal line is in contact with the second plug which is brought into contact with the first step-coverage metal film over the second dielectric film pattern. A second step-coverage metal film (lower electrode of third capacitor), being in contact with the second plugs which are respectively brought into contact with the first metal line and the fourth metal film, overlapped with the first metal line and the fourth metal film at a predetermined interval from the second metal line over the second dielectric film pattern. A third insulator film pattern and a sixth metal film are formed in sequence to be disconnected from the inner lateral side of the second step-coverage metal film over the second step-coverage metal film. A third dielectric film including a plurality of third plugs being in contact with the second metal line, the sixth metal film and the second step-coverage metal film over the second step-coverage metal film and the second metal line. A first upper metal electrode is in contact with the third plug which is brought into contact with the second metal line over the third dielectric film. A second upper metal electrode is in contact with the plurality of third plugs which are brought into contact with the second step-coverage metal film and the sixth metal film over the third dielectric film.

Embodiments relate to method of manufacturing a capacitor of semiconductor device which includes forming a first metal film provided with a recess having a predetermined depth over a semiconductor substrate. An insulator film and a second metal film are deposited over the recess with a predetermined thickness corresponding to a depth of the recess. A dielectric film pattern including plugs is formed in contact with the first metal film and the second metal film over the first metal film and the second metal film.

Embodiments relate to a method of manufacturing a capacitor of semiconductor device which includes forming a first metal film provided with a recess having a predetermined depth over a semiconductor substrate. A first insulator film and a second metal film are formed in the recess, wherein the first insulator film and the second metal film are disconnected from an inner lateral side of the recess. A first dielectric film pattern including a plurality of first plugs are formed in contact with the first metal film and the second metal film over the first metal film. A first metal line is formed in contact with the first plug which is in contact with the first metal film over the first dielectric film pattern. A first step-coverage metal film is formed in contact with the first plug which is brought into contact with the second metal film, provided at a predetermined interval from the first metal line. A second insulator film and a fourth metal film are formed to be disconnected from the inner lateral side of the first step-coverage metal film over the lower portion of the first step-coverage metal film. A second dielectric film pattern including a plurality of second plugs formed in contact with the first metal line, the fourth metal film and the first step-coverage metal film over the first metal line and the first step-coverage metal film. A second metal line in contact with the second plug which is in contact with the first step-coverage metal film over the second dielectric film pattern. A second step-coverage metal film formed in contact with the second plugs which are in contact with the first metal line and the fourth metal film, provided at a predetermined interval from the second metal line over the second dielectric film pattern. A third insulator film pattern and a sixth metal film (upper electrode of third capacitor) are formed in sequence and disconnected from the inner lateral side of the second step-coverage metal film over the upper portion of the second step-coverage metal film. A third dielectric film pattern including a plurality of third plugs formed in contact with the second metal line, the sixth metal film and the second step-coverage metal film over the second step-coverage metal film and the second metal line. A first upper metal electrode formed in contact with the third plug which is brought into contact with the second metal line over the third dielectric film. A second upper metal electrode is formed in contact with the plurality of third plugs which are in contact with the second step-coverage metal film and the sixth metal film over the third dielectric film.

DRAWINGS

FIGS. 1A to 1D are cross sectional views explaining a manufacturing method of a MIM capacitor in a semiconductor device according to the related art.

Example FIGS. 2A to 2F are cross sectional views explaining a manufacturing method of a MIM capacitor in a semiconductor device according to embodiments.

Example FIGS. 3A to 3J are cross sectional views explaining a manufacturing method of a stack MIM capacitor in a semiconductor device according to embodiments.

Example FIG. 4 is an equivalent circuit diagram of FIG. 3J.

DESCRIPTION

Example FIGS. 2A to 2F are cross sectional views explaining a manufacturing method of a MIM capacitor in a semiconductor device according to embodiments. As shown in example FIG. 2A, a first metal film having a predetermined thickness may be formed over a semiconductor substrate 200. Then, a photoresist layer may be coated over the first metal film, and the coated photoresist layer is patterned, thereby forming a first photoresist pattern. The first metal film may be formed of aluminum (Al) or copper (Cu) at a predetermined thickness between approximately 4000 Å and 5000 Å.

By performing an etching process using the first photoresist pattern as a mask, the first metal film 201 is provided with a recess having a predetermined depth. Then, the first photoresist pattern is removed by etching and cleaning. In this case, the recess included in the first metal film (lower capacitor electrode) 201 is formed to depth of about 1250 Å to 1440 Å.

An insulator film 204 provided with a thickness of about 700 Å to about 840 Å. A second metal film (upper capacitor electrode) 205 provided at a thickness of about 450 Å to 600 Å are sequentially deposited over an entire surface of the first metal film (lower capacitor electrode) 201, whereby the recess is filled-up.

Then, a planarization process using a CMP (chemical mechanical polishing) is carried out to expose the first metal film (lower capacitor electrode) 201. The total thickness of the insulator film 204 and second metal film (upper capacitor electrode) 205 deposited in sequence may correspond to the depth of the recess included in the first metal film 201. Also, the upper surface of the second metal film 205 may be the same height as the upper surface of the first metal film 201. The second metal film 205 may be formed of aluminum (Al) or copper (Cu).

As shown in example FIG. 2B, a photoresist layer is coated over the first metal film (lower capacitor electrode) 201 including the insulator film 204 and the second metal film (upper capacitor electrode) 205, and then the coated photoresist layer is patterned, thereby forming a second photoresist pattern 206. The first metal film 201 is selectively etched to the initial recess depth using the second photoresist pattern 206 as a mask. This etching process disconnects the lateral sides of the insulator film 204 and second metal film 205 from the inner lateral side of the recess in the first metal film 201.

Referring to example FIG. 2C, the second photoresist pattern 206 is removed by etching and cleaning. A first dielectric film is formed over an entire surface of the first metal film 201 a including the insulator film 204 and the second metal film 205. To form contact holes in the first dielectric film, a photoresist layer is coated and patterned, thereby forming a third photoresist pattern. An etching process using the third photoresist pattern as a mask is performed to selectively etch the first dielectric film, thereby forming a first dielectric film pattern 207 including the contact holes.

The third photoresist pattern is removed by etching and cleaning. A conductive film is deposited over the first dielectric film pattern 207 including the contact holes, so that the contact holes are filled up with conductive material. A planarization process using a CMP exposes the first dielectric film pattern 207, forming plugs 208 which contact the first and second metal films.

As shown in example FIG. 2D, a third metal film is deposited over the first dielectric film pattern 207 including the plugs 208. A photoresist layer is coated over the third metal film, and the coated photoresist layer is patterned to form a fourth photoresist pattern. The third metal film is etched selectively using the fourth photoresist pattern as a mask, thereby forming third metal film patterns (metal electrodes) 209 in contact with the plugs 208. Then, the fourth photoresist pattern is removed by etching and cleaning.

As shown in example FIG. 2E, a second dielectric film 210 is deposited over the entire surface of the semiconductor substrate 200 including the third metal film patterns 209. Then, a photoresist layer is coated over the second dielectric film 210, and the coated photoresist layer is patterned to form a fifth photoresist pattern 211. The second dielectric film 210 may be formed of a silicon nitride (Si₃N₄) film.

Referring to example FIG. 2F, an etching process using the fifth photoresist pattern 211 as a mask is applied to the entire surface of the semiconductor substrate 200. The second dielectric film 210 is selectively etched to create openings to the metal electrodes 209, thereby forming a second dielectric film pattern 210 a. Then, the fifth photoresist pattern 211 is removed by etching and cleaning, thereby completing an MIM capacitor of semiconductor device.

The semiconductor device manufactured by the aforementioned process can prevent a step coverage issue between the MIM capacitor region and its circumferential region. The total thickness of the deposited insulator film 204 and second metal film (upper capacitor electrode) 205 corresponds to the depth of the recess included in the first metal film (lower capacitor electrode) 201.

Example FIGS. 3A to 3J are cross sectional views explaining a manufacturing method of a stack MIM capacitor in a semiconductor device according to embodiments. As shown in example FIG. 3A, a first metal film having a predetermined thickness may be formed over a semiconductor substrate 300. Then, a photoresist layer may be coated over the first metal film, and the coated photoresist layer is patterned, thereby forming a first photoresist pattern. The first metal film may be formed of aluminum (Al) or copper (Cu) at a predetermined thickness between approximately 4000 Å and 5000 Å.

By performing an etching process using the first photoresist pattern as a mask, the first metal film 301 is provided with a recess having a predetermined depth. In this case, the first metal film 301 indicates a lower electrode of a first capacitor (C1). Then, the first photoresist pattern is removed by etching and cleaning. In this case, the recess included in the first metal film (lower capacitor electrode) 301 is formed to depth of about 1250 Å to 1440 Å.

An insulator film 304 provided with a thickness of about 700 Å to about 840 Å. A second metal film (upper capacitor electrode) 305 provided at a thickness of about 450 Å to 600 Å are sequentially deposited over an entire surface of the first metal film (lower capacitor electrode) 301, whereby the recess is filled up.

Then, a planarization process using a CMP (chemical mechanical polishing) is carried out to expose the first metal film (lower capacitor electrode) 301. The total thickness of the insulator film 304 and second metal film (upper capacitor electrode) 205 deposited in sequence may correspond to the depth of the recess included in the first metal film 301. Also, the upper surface of the second metal film 305 may be the same height as the upper surface of the first metal film 301. The second metal film 305 may be formed of aluminum (Al) or copper (Cu).

As shown in example FIG. 3B, a photoresist layer is coated over the first metal film (lower capacitor electrode) 301 including the insulator film 304 and the second metal film (upper capacitor electrode) 305, and then the coated photoresist layer is patterned, thereby forming a second photoresist pattern 306. The first metal film 301 is selectively etched to the initial recess depth using the second photoresist pattern 306 as a mask. This etching process disconnects the lateral sides of the insulator film 304 and second metal film 305 from the inner lateral side of the recess in the first metal film 301.

Referring to example FIG. 3C, the second photoresist pattern 306 is removed by etching and cleaning. A first dielectric film is formed over an entire surface of the first metal film 301 a including the insulator film 304 and the second metal film 305. To form contact holes in the first dielectric film, a photoresist layer is coated and patterned, thereby forming a third photoresist pattern. An etching process using the third photoresist pattern as a mask is performed to selectively etch the first dielectric film, thereby forming a first dielectric film pattern 307 including the contact holes.

The third photoresist pattern is removed by etching and cleaning. A conductive film is deposited over the first dielectric film pattern 307 including the contact holes, so that the contact holes are filled up with conductive material. A planarization process using a CMP exposes the first dielectric film pattern 307, forming plugs 308 which contact the first and second metal films.

As shown in example FIG. 3D, a third metal film having a predetermined thickness is deposited over the first dielectric film pattern 307. After that, a photoresist layer is coated over the third metal film, and the coated photoresist layer is patterned to form a fourth photoresist pattern. The third metal film is etched selectively using the fourth photoresist pattern as a mask, thereby providing a second recess having a predetermined depth. Then, the fourth photoresist pattern is removed by etching and cleaning.

Next, a second insulator film 310 having a predetermined thickness and a fourth metal film 311 are sequentially deposited over an entire surface of the third metal film 309, whereby the second recess is filled up. In this case, the fourth metal film 311 indicates an upper electrode of the second capacitor (C2). A planarization process using a CMP exposes the upper surface of the third metal film 309.

As shown in example FIG. 3E, a photoresist layer is coated over the third metal film 309 and patterned to form a fifth photoresist pattern. The third metal film 309 is selectively etched to the depth of second recess using the fifth photoresist pattern as a mask to disconnect the lateral sides of the second insulator film 310 and fourth metal film 311 from the inner lateral side of the second recess in the third metal film 309. The total thickness of the second insulator film 310 and fourth metal film 311 may correspond to the depth of the second recess. Then, the fifth photoresist pattern is removed by etching and cleaning.

A photoresist layer is coated over the third metal film 309 including the second insulator film 310 and the fourth metal film 311, and then the coated photoresist layer is patterned to form a sixth photoresist pattern. The third metal film 309 is selectively etched using the sixth photoresist pattern as a mask, whereby the third metal film 309 is divided. Through the selective etching process, a first step coverage metal film 309 a is formed to be overlapped with the second metal film (upper electrode of first capacitor) 305 and to be in contact with the first plug 308.

A first metal line 309 b is overlapped with a predetermined portion of the first metal film 301 a, whereby the first metal line 309 b is in contact with the first plug 308. The first step-coverage metal film 309 a and the first metal line 309 b are divided, so that the first step-coverage metal film 309 a is positioned at a predetermined interval from the first metal film pattern 309 b. The sixth photoresist pattern is removed by etching and cleaning. The upper surface of the fourth metal film 311 may be the same height as the upper surfaces of the first step-coverage metal film 309 a and first metal line 309 b.

As shown in example FIG. 3F, a second dielectric film is formed over the entire surface of the semiconductor substrate 300 including the first metal line 309 b and the first step-coverage metal film 309 a. After that, a photoresist layer is coated over the second dielectric film, and then the coated photoresist layer is patterned to form a seventh photoresist pattern. The second dielectric film is selectively etched using the seventh photoresist pattern as a mask, thereby forming a second dielectric film pattern 312 including a plurality of contact holes. Then, the seventh photoresist pattern is removed by etching and cleaning.

A second conductive film is deposited over the second dielectric film pattern 312 including the plurality of contact holes so as to fill up the plurality of contact holes. A planarization process using a CMP exposes the upper surface of the second dielectric film pattern 312, thereby forming a plurality of second plugs 313 which are in contact with the first metal line 309 b, the fourth metal film 311 and the first step-coverage metal film 309 a.

As shown in example FIG. 3G, a fifth metal film having a predetermined thickness is formed over the second dielectric film pattern 312. Then, a photoresist layer is coated over the fifth metal film, and the coated photoresist layer is patterned to form an eighth photoresist pattern. The fifth metal film is selectively etched using the eighth photoresist pattern as a mask, thereby forming a fifth metal film 314 with a third recess having a predetermined depth. Then, the eighth photoresist pattern is removed by etching and cleaning.

The third recess is filled up by depositing a third insulator film 315 and a sixth metal film 316 over an entire surface of the fifth metal film 314. The sixth metal film 316 constitutes an upper electrode of the third capacitor (C3). A planarization process using a CMP exposes the upper surface of the fifth metal film 314.

As shown in example FIG. 3H, a photoresist layer is coated over the fifth metal film 314 including the third insulator film 315 and the sixth metal film 316, and then the coated photoresist layer is patterned to form a ninth photoresist pattern. The fifth metal film 314 is selectively etched to the depth of third recess using the ninth photoresist pattern as a mask to disconnect the lateral sides of the third insulator film 315 and the sixth metal film 316 from the inner lateral side of the third recess included in the fifth metal film 314. The total thickness of the third insulator film 315 and sixth metal film 316 may correspond to the depth of third recess. The ninth photoresist pattern is removed by etching and cleaning.

Thereafter, a photoresist layer is coated over the fifth metal film 314 including the third insulator film 315 and the sixth metal film 316, and then the coated photoresist layer is patterned to form a tenth photoresist pattern. The fifth metal film 314 is selectively etched using the tenth photoresist pattern as a mask, thereby forming a second metal film pattern (second metal line) 314 b which contacts the second plug 313.

Through the aforementioned selective etching process, a second step-coverage metal film (lower electrode of third capacitor) 314 a is formed to be in contact with the second plugs 313, which are in contact with the first metal line 309 b and the fourth metal film 311. Then, the tenth photoresist pattern is removed by etching and cleaning. The upper surface of the sixth metal film 316 may be the same height as the upper surfaces of the second metal film pattern 314 b and second step-coverage metal film (lower electrode of third capacitor) 314 a.

As shown in example FIG. 3I, a third dielectric film is formed over the entire surface of the semiconductor substrate 300 including the second metal film pattern 314 b and the second step-coverage metal film 314 a. Then, a photoresist layer is coated over the third dielectric film, and the coated photoresist layer is patterned to form an eleventh photoresist pattern. The third dielectric film is selectively etched using the eleventh photoresist pattern as a mask to form a third dielectric film pattern 317 including a plurality of contact holes. Then, the eleventh photoresist pattern is removed by etching and cleaning.

Next, a third conductive film is deposited over the third dielectric film pattern 317 including the plurality of contact holes so as to fill up the plurality of contact holes. A planarization process using a CMP is performed to expose the upper surface of the third dielectric film pattern 317, thereby forming third plugs 318 which are in contact with the second metal line 314 b, the second step-coverage metal film 314 a and the sixth metal film.

As shown in example FIG. 3J, a seventh metal film is formed over the third dielectric film pattern 317. Then, a photoresist layer is coated over the seventh metal film, and the coated photoresist layer is patterned to form a twelfth photoresist pattern. The seventh metal film is selectively etched using the twelfth photoresist pattern as a mask, and thereby divided into seventh metal film patterns 319 over the third dielectric film pattern 317. The first upper metal film pattern 319 a (positioned at the left side of example FIG. 3J) contacts the third plug 318. The second upper metal pattern 319 b (positioned at the right side of example FIG. 3J) contacts the third plug 319 which are in contact with the second metal film pattern (second metal line) 314 b and the sixth metal film (upper electrode of third capacitor) 316. Then, the twelfth photoresist pattern is removed by etching and cleaning.

Thereafter, a fourth dielectric film is formed over the seventh metal patterns 319. Then, a thirteenth photoresist pattern is formed over the fourth dielectric film, and an etching process using the thirteenth photoresist pattern as a mask is performed to form a fourth dielectric film pattern 320 which provides openings over the seventh metal film. Thereafter, the twelfth photoresist pattern is removed by etching and cleaning.

Through the aforementioned manufacturing process, the semiconductor device according to embodiments includes the first MIM capacitor (C1) formed over the first metal film (lower electrode of first capacitor) 301 a; the second MIM capacitor (C2) formed over the second step-coverage metal film (lower electrode of second capacitor) 309 a; and the third MIM capacitor (C3) formed over the second step-coverage metal film (lower electrode of third capacitor) 314 a.

Accordingly, the semiconductor device according to embodiments can prevent the step coverage issue between the MIM capacitor region and its circumferential region having no MIM capacitor therein, so that it is possible to form stack-structure MIM capacitors with the equivalent circuit of example FIG. 4. In example FIG. 4, the capacitor can obtain the capacity of “C=3 C1” if C1=C2=C3.

The capacitor according to embodiments can prevent the step coverage issue caused by the thickness of insulator film and upper metal film included the metal-insulator-metal (MIM) capacitor, between the MIM capacitor region and its circumferential region having no MIM capacitor therein. Also, the capacitor according to embodiments can prevent a DOF (Depth of Focus) issue by preventing the step coverage issue over the upper insulator film.

It will be obvious and apparent to those skilled in the art that various modifications and variations can be made in the embodiments disclosed. Thus, it is intended that the disclosed embodiments cover the obvious and apparent modifications and variations, provided that they are within the scope of the appended claims and their equivalents. 

1. An apparatus comprising: a first metal film provided with a recess having a predetermined depth over a semiconductor substrate; an insulator film and a second metal film formed in the recess with a thickness corresponding to a depth of the recess, wherein the insulator film and metal film are disconnected from an inner lateral side of the recess; a dielectric film including a plurality of plugs over the first metal film, the insulator film and the second metal film, wherein the plugs are in contact with the first metal film and the second metal film; and a plurality of metal electrodes in contact with the plugs on the dielectric film.
 2. The apparatus of claim 1, further comprising a nitride film, formed over the metal electrodes, to open predetermined portions of the metal electrode.
 3. The apparatus of claim 1, wherein the upper surface of the second metal film is in the same height as the upper surface of the first metal film.
 4. An apparatus comprising: a first metal film provided with a recess having a predetermined depth over a semiconductor substrate; and a plurality of capacitors formed by sequentially depositing an insulator film and a second metal film over the recess.
 5. The apparatus of claim 4, wherein the upper surface of the first metal film is in the same height as the upper surface of the second metal film formed over the insulator film.
 6. The apparatus of claim 4, wherein the total thickness of the insulator film and second metal film corresponds to the depth of the recess.
 7. The apparatus of claim 4, wherein the insulator film and second metal film are disconnected from the inner lateral side of the recess included in the first metal film.
 8. An apparatus comprising: a first metal film provided with a recess having a predetermined depth over a semiconductor substrate; a first insulator film and a second metal film formed in the recess with a thickness corresponding to a depth of the recess, wherein the first insulator film and second metal film are disconnected from an inner lateral side of the recess; a first dielectric film pattern including a first plurality of plugs which are in contact with the first metal film and the second metal film; a first metal line in contact with a first plug among the first plurality of plugs which is in contact with the first metal film; a first step-coverage metal film, provided at a predetermined interval from the first metal line, in contact with a second plug among the first plurality of plugs in contact with the second metal film; a second insulator film and a fourth metal film disconnected from the inner lateral side of the first step-coverage metal film over the lower portion of the first step-coverage metal film; a second dielectric film pattern including a second plurality of plugs which are in contact with the first metal line, the fourth metal film and the first step-coverage metal film over the first metal line and the first step-coverage metal film; a second metal line in contact with a first plug among the second plurality of plugs which is in contact with the first step-coverage metal film over the second dielectric film pattern; a second step-coverage metal film in contact with a second plug among the second plurality of plugs which is in contact with the first metal line and the fourth metal film, overlapped with the first metal line and the fourth metal film at a predetermined interval from the second metal line over the second dielectric film pattern; a third insulator film pattern and a sixth metal film, formed to be disconnected from the inner lateral side of the second step-coverage metal film over the second step-coverage metal film; a third dielectric film including a third plurality of plugs in contact with the second metal line, the sixth metal film and the second step-coverage metal film over the second step-coverage metal film and the second metal line; a first upper metal electrode being in contact with a first plug among the third plurality of plugs which is in contact with the second metal line over the third dielectric film; and a second upper metal electrode in contact with a second plug among the third plurality of plugs which is in contact with the second step-coverage metal film and the sixth metal film over the third dielectric film.
 9. The apparatus of claim 8, wherein the upper surface of the first metal film is at the same height as the upper surface of the first metal film.
 10. The apparatus of claim 8, wherein the upper surface of the second metal film is at the same height as the upper surfaces of the first metal line and first step-coverage metal film.
 11. The apparatus of claim 8, wherein the upper surface of the sixth metal film is at the same height as the upper surfaces of the second metal line and second step-coverage metal film.
 12. The apparatus of claim 8, further comprising a silicon nitride film to open a predetermined portion of the metal electrode over the third dielectric film.
 13. The apparatus of claim 8, wherein the first metal film, the first step-coverage metal film and the second step-coverage metal film are formed of one of aluminum or copper.
 14. The apparatus of claim 8, wherein the first insulator film pattern, the second insulator film pattern, and the third insulator film pattern are formed of one of silicon oxide or silicon nitride.
 15. A method comprising: forming a first metal film provided with a recess having a predetermined depth over a semiconductor substrate; sequentially depositing an insulator film and a second metal film over the recess at a predetermined thickness corresponding to a depth of the recess; and forming a dielectric film pattern including plugs in contact with the first metal film and the second metal film.
 16. The method of claim 15, wherein the upper surface of the first metal film is at the same height as the upper surface of the second metal film.
 17. A method comprising: forming a first metal film provided with a recess having a predetermined depth over a semiconductor substrate; forming a first insulator film and a second metal film in the recess, wherein the first insulator film and the second metal film are disconnected from an inner lateral side of the recess; forming a first dielectric film pattern including a first plurality of plugs which are in contact with the first metal film and the second metal film; forming a first metal line being in contact with a first plug among the first plurality of plugs which is in contact with the first metal film; forming a first step-coverage metal film in contact with a second plug among the first plurality of plugs which is in contact with the second metal film, provided at a predetermined interval from the first metal line; forming a second insulator film and a fourth metal film disconnected from the inner lateral side of the first step-coverage metal film over the lower portion of the first step-coverage metal film; forming a second dielectric film pattern including a second plurality of plugs which are in contact with the first metal line, the fourth metal film and the first step-coverage metal film over the first metal line and the first step-coverage metal film; forming a second metal line in contact with a first plug among the second plurality of plugs which is in contact with the first step-coverage metal film; forming a second step-coverage metal film in contact with the second plug among the second plurality of plugs which is in contact with the first metal line and the fourth metal film, provided at a predetermined interval from the second metal line over the second dielectric film pattern; forming a third insulator film pattern and a sixth metal film disconnected from the inner lateral side of the second step-coverage metal film over the upper portion of the second step-coverage metal film; forming a third dielectric film pattern including a third plurality of plugs in contact with the second metal line, the sixth metal film and the second step-coverage metal film over the second step-coverage metal film and the second metal line; forming a first upper metal electrode in contact with a first plug among the third plurality of plugs which is in contact with the second metal line over the third dielectric film; and forming a second upper metal electrode in contact with a second plug among the third plurality of plugs which is in contact with the second step-coverage metal film and the sixth metal film over the third dielectric film.
 18. The method of claim 17 wherein forming the first metal film comprises: depositing a first metal film over the semiconductor substrate; forming a first photoresist pattern over the first metal film; forming the first metal film provided with the recess having a predetermined depth by selectively etching the first metal film using the first photoresist pattern as a mask; and removing the first photoresist pattern.
 19. The method of claim 17, wherein forming the first insulator film pattern and the second metal film comprises: filling up the recess by depositing the first insulator film and the second metal film over the first metal film; performing a planarization process to expose the upper surface of the first metal film; forming a second photoresist pattern over the first metal film, the first insulator film and the second metal film; etching the first metal film to the depth of the recess, using the second photoresist pattern as a mask, to disconnect the lateral sides of the first insulator film and second metal film from the inner lateral side of the recess; and removing the second photoresist pattern.
 20. The method of claim 17, wherein forming the first step-coverage metal film comprises: depositing a metal film over the first dielectric film pattern; forming a third photoresist pattern over the metal film; forming a first metal film provided with a first recess by performing an etching process using the third photoresist pattern as a mask; removing the third photoresist pattern; filling up the first recess by depositing the second dielectric film and the fourth metal film over the entire surface of the first metal film including the first recess; performing a planarization process on the first metal film, the second dielectric film and the fourth metal film; forming a fourth photoresist pattern over the first metal film; selectively etching the first metal film to the depth of the first recess, using the fourth photoresist pattern as a mask, to disconnect the lateral sides of the second dielectric film and second metal film from the inner lateral side of the first recess; removing the fourth photoresist pattern; forming a fifth photoresist pattern over the first metal film; forming the first metal line and the first step-coverage metal film by dividing the first metal film through the etching process using the fifth photoresist pattern as a mask; and removing the fifth photoresist pattern. 